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Did quick search, no silent voices there. At least i found none.
At 1:28 and 1:40 there are some very high-frequency beeps. You guys might have missed that, because older people lose the ability to hear that high frequencies. Both sound to me like .-.., though the first one is sped up and more silent
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The Almighty Internet tells me that's an "L", but I've got no idea where that fits in the whole message.